<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // let a = 1, b = 1;
      let a = 1;
      let b = 1;

      let x = a++; // 1
      let y = --b; // 0
    </script>
  </body>
</html>
